Influence of invasive Acer negundo leaf litter on benthic microbial abundance and activity in the littoral zone of a temperate river in Lithuania | Knowledge and Management of Aquatic Ecosystems

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Table 1

Chemical parameters of bottom sediments in the littoral sites of the River Neris, 2013–2014 (mean values ± SD). Different letters in a row indicate significant differences among sites for each parameter (ANOVA test with Tukey HSD, p ≤ 0.05).

Leaf litter accumulation zones	Parameters

	N_t, %	P_t, %	C_org, %	H₂S+HS⁻, mg/dm³	S/SO₄²⁻, mg/dm³	C/N
26–28 March
A. negundo	–	–	7.2 ± 0.3^a	144 ± 11^a	23.0 ± 1.5^a	–
A. glutinosa	–	–	6.9 ± 0.1^ab	120 ± 8^b	20.5 ± 1.3^b	–
Zone without leaf litter	–	–	2.9 ± 0.2^c	44 ± 3^c	15.3 ± 0.9^c	–

31 July–2 August
A. negundo	0.10 ± 0.01^a	0.025 ± 0.002^a	5.9 ± 1.7^a	265 ± 18^a	26.1 ± 1.4^a	58 ± 11^b
A. glutinosa	0.07 ± 0.01^ab	0.024 ± 0.002^ab	7.8 ± 0.8^b	218 ± 11^b	23.2 ± 1.3^b	111 ± 5^a
Zone without leaf litter	0.04 ± 0.02^c	0.016 ± 0.00^c	0.7 ± 0.1^c	150 ± 18^c	16.7 ± 1.0^c	22 ± 9^c

16–18 October
A. negundo	0.24 ± 0.02^a	0.035 ± 0.003^b	9.0 ± 0.5^a	269 ± 11^a	38.4 ± 1.4^a	38 ± 2^b
A. glutinosa	0.10 ± 0.02^b	0.052 ± 0.003^a	6.9 ± 0.2^b	220 ± 11^b	37.4 ± 1.1^ab	72 ± 13^a
Zone without leaf litter	0.06 ± 0.01^c	0.024 ± 0.005^c	1.5 ± 0.4^c	92 ± 23^c	14.2 ± 2.1^c	25 ± 3^c

–, not determined.

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